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A distributed computing project has been set up that aims to crack unbroken Enigma ciphers dating back to World War II. One of four unbroken Nazi codes has already succumbed. The M4 project is seeking help from the net community in breaking the other three codes.

Computer users interested in getting involved can download a client onto their PCs which takes advantage of idle processing time to perform number crunching in much the same way the popular SETI@Home screen saver was used to analyse radio telescope signals from space in the search for extra-terrestrial intelligence. The name of the project comes from the belief that the signals were encoded using a four rotor Enigma M4 device. The signals analysed by the project were captured in the North Atlantic in 1942. ®